Password security

[Aveao]

Actually it is better to remember you passwords by heart, but not password managers. Nor random passwords. So I usually create a password like [username]@[websitename]+[some fixed characters that is same for every password].

It is like a function pwd(x)=u(x)+w(x)+c

I may not use any password managers this way. 
Without using a password manager, there is basically no one who can find out this pwd(x) and crack your password